77646240890 has 32 divisors (see below), whose sum is σ = 140013147456. Its totient is φ = 31003018240.

The previous prime is 77646240871. The next prime is 77646240899. The reversal of 77646240890 is 9804264677.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (77646240899) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16613594 + ... + 16618266.

It is an arithmetic number, because the mean of its divisors is an integer number (4375410858).

Almost surely, 2^77646240890 is an apocalyptic number.

77646240890 is a deficient number, since it is larger than the sum of its proper divisors (62366906566).

77646240890 is a wasteful number, since it uses less digits than its factorization.

77646240890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7294.

The product of its (nonzero) digits is 4064256, while the sum is 53.

The spelling of 77646240890 in words is "seventy-seven billion, six hundred forty-six million, two hundred forty thousand, eight hundred ninety".